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Do I really need a catch can?
After eliminating the vent line from the WUR (eWUR now) and the vent line from the turbo catch can (solid plug) I'm left with two of the original lines that went back into the old airbox: the large (~1" ID) line from the air-oil separator, and the smaller line that goes overboard to the canister in the RHS wheel well.
Is there any reason I can't just connect the two together an eliminate a catch can?
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan '14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button! |
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03-25-2019, 05:09 AM
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Just vent the AOS to atmosphere with a small filter on the end. The charcoal canister can be vented to atmosphere or run it back into your air filter.
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03-31-2019, 04:23 AM
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Join Date: Apr 2007
Location: Seattle
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I tried venting to atmosphere with a small filter a few years ago but it left my engine bay covered with a fine mist of oil so I added a catch can. YMMV
A bit OT but, how’s the FrankinCIS working out ? Do you have a thread on it ? I’m super interested but my cars a 81 and doesn’t have lambda (no clue to how it’s actually spelled) so I don’t think it’s an option for me.
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81 Pacific Blue 930 Euro coupe slicktop on a strict diet, Rarlyl8 headers, Blowzilla turbo, Tial waste gate, Full bay I/C, Home made center out exhaust, Leask WUR, MSD 6AL, PLX wideband Wevo shifter, LSD. Next up, Cams, Heads and port work |
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03-31-2019, 09:44 AM
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He already has a catch can - the AOS, at least I think he does. I just ran the vent from the AOS down thru the right side tin with a filter on the end.
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03-31-2019, 09:59 AM
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I have the factory AOS
When I originally ditched my mailbox air filter for the k&n cone I had a vent line from the turbo oil sump, the WUR, the AOS, and the charcoal canister. However, I now how a plug not a vent in the turbo oil sump, I'm ditching my WUR for an eWUR so no vent there. That leaves me with the charcoal canister in the RHS wheel well, and the vent line from the AOS. I was running with a catch can for a while before I took the car down for the last set of upgrades and that can definitely had oil in it. Not a lot, but enough to make a mess of the engine compartment. I ended up buying one from summit but unsure yet on whether to use it. As far as the FrankenCIS installation. I proved out that the system works pretty well using just the lambda valve, now I'm taking it a step further. Quite a few steps further in fact, with ignition control, constant baro adjustment, soft rev limiting, electronic boost control and hopefully knock detection/retard. Everything seems to take about three times as long as I plan but I pretty much just have a day or so's worth of wiring to do before I can start cranking the car over. I have a local dyno guy set up to tune once I get to the point where its basically drivable. I'll do a full write up when done.
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan '14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button! |
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03-31-2019, 11:19 AM
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